Educational device.



W. W. HOLMES.

EDUCATIONAL DEVICE.

APPLICATION FILED ocT. 10.1914.

Patnted Feb. 8, 1916.

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W. W. HOLMES.

EDUCATIONAL DEVICE.

APPLICATION man 00T. 10, 1914.

573 Peeee'eed Feb. 8,1916.

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WALTER W. HOLMES, OF WATERBU'RY, CONNECTICUT.

EDUCATIONAL DEVICE.

Specification of Letters Patent.

Patented Feb. 8, i916.

Application filed October 10, 1914. Serial No. 865,992.

' To all whom it may concern.'

Be it known that LVALTER YVV. HOLMES, a citizen of the United `States ofAmerica, and a resident of Waterbury, county of New Haven, State ofConnecticut, have invented certain new and useful Improvements inEducational Devices, of which the following is a specification.

This invention relates to a device for ed ucational and instructionalpurposes whereby desired point or points may be located from two or moremain points by means of locating elements pivotally or otherwise movablyconnected at such main points. For example, my invention may be appliedto an educational `device for locating a city on a map. In one form ofmy invention, such map may have the place of location of the city inquestion previously indicated thereon, and by the use of the aforesaidmovable elements such place of location of the city will be ascertainedreadily and with certainty. In other forms of my invention, the generalcontour of the country or countries will have been indicated on the mapand the place of location of the city` in question will be determined bythe use of the aforesaid movable elements. In the usual forms of myinvention, the movable elements are two strips preferably pivoted at twomain points. Such main points may be the places of location of twoprincipal cities, or two points located substantially at extreme pointsof the map, such as the upper left hand and upper right hand corners ofthe map. Such map need not be drawn in a plane, but may be in the formof a globe or other curved map.

To illustrate one form of my invention applied to a terrestrial map, wewill assume the map to be a map of Europe and one strip pivoted at thepoint of location of London and the other strip pivoted at the locationof Petrograd. On the London strip will be indicated the names of thepoints desired to be located and indications of the air line orcorresponding distances of such points from London. On the Petrogradstrip will be indicated the names of the same points desired to belocated and similar indications of the distances of suoli points fromPetrograd. Thus, to locate Rome, the London strip and the Petrogradstrip are moved toward one another until the Rome indication on theLondon strip coincides with the Rome indication on the Petrograd strip,the intersection giving the point of location of Rome. i

Other features and objects of my invention will be more fully understoodfrom the following description and the accompanying drawings, in which-Figure 1 shows one form of an educational device showing` the locatingstrips to be attached at the upper right hand and upper left handcorners of the map; Fig. 2 shows a somewhat similar form and indicatesthe use of the movable elements for determining the positions of desiredpoints on the map; and Fig. 3 shows a modified form wherein London andPetrograd strips are employed.

The map indicated in Fig. l is a map of Europe; such map may be printedor drawn directly on the face of base l of the device or on paper or thelike aiiixed to the face of said base l. The strip 2 is shown pivoted atl to the upper left hand corner of the map and the strip 3 is shownpivoted at 5 to the upper right hand corner of the map. Such pivotingmay be effected by inserting a pin through strips 2 and 3 and seated inthe base 1, or by means of other suitable fastening` means. 0n strip 2are indicated in succession, in accordance with the respective air linedistances, the cities Christiania, Hague, Brussels, Paris, etc.Similarly.I on the strip 3 vare arranged the names of the placesindicated on strip 2 but in the order of their respective air linedistances. Thus, on strip 3 are arranged in proper order Petrograd,Stockholm, Christiania, Copenhagen, etc. The illustrated positions ofthe strips 2, 3, indicate the procedure for linding Rome on the map. Inthis case, the strips 2 and 3 will have been moved about theirrespective pivotal points 4:, 5, until the Rome indication on strip 2coincides with the Rome indication on strip 3, thereby giving the pointof location of Rome on the map. Now, if it is desired to locate Berlin.strip 2 will be swung toward the right and strip 5 will be swung towardthe left until the Berlin indication on strip 2` coincides with theBerlin indication on strip 3.

It will be noted that the several indications on strips 2, 3, arearranged proximate both edges, thereby affording use of both edges ofeach strip. If the space on one face of each strip does not providesufficient room for the number of points desired to loe located theopposite face of the strip may be also employed, in which case thepivotal means will be selected to adapt the strip to be readilyreversed.

Fig. 2 illustrates the application of my invention to determining citiesand other points on a inap showing the general bound- 'aries of theseveral countries. rllhe map of Fig. 2 is a map of the boundaries of aportion of Europe ivhei'eon none of the cities has been indicated. Thus,to locate London, the London indication on strip 2 is brought intocoincidence with the London indication on strip 3 and the point ofintersection indicated on'the map as by means of a pencil or the like,thus giving the place of location of London. rJihe determination ofother cities and points on the map will be effected in a similar'manner. The strips 2, 3 are shown provided with indications G of the airline distances in miles or other units of the respective cities or otherpoints from their respective pivotal points of the strips.

F ig. 3 illustrates a modification in Which the strip 2 is pivotallyconnected at the point of location of London and the strip 3 ispivotally connected at the point of location of Petrograd. Theillustrated positions of strips Q, 3, indicate the procedure for de,-termining the location of Lemberg-on a map which is being completed inthe aforesaid manner or for locating Lemberg on a map on Which the pointof location of Lemberg Was previouslyT printed. If it is desired toemploy a globe such strips 2, 3 will be pivotally connected at properlyrelated points and the strips 2, 3, curved in correspondence to thecurvature of the globe. Such arrangement will be applicable forterrestrial globes and also for celestial globes. lt Will be clear thatmy invention is applicable for locating any desired point or points onany plane or curved surface by means of tivo movable elementsrespectively bearing indications of such point or points.

Vhereas I have described my invention by reference to specific formsthereof, it will be understood that many changes and modifications maybe made Without departing from the spirit of my invention. y

What I claim and desire to secure by Letters Patent is l. In aneducational device, the combinan tion of a surface bearing a map, astrip movably connected at a certain point on said surface and havingindications of desired points thereon Vand a second strip movablyconnected at another certain point on said surface and bearingVcorresponding indications of said points.

2. In an educational device, the combination With a surface` bearing'amap, of a strip pivotally `connected thereto at a certain point,indications of desired points arranged Von said strip in the order oftheir respective 3. ln an educational device, the combination with asurface bearing a map, of a strip extending in a surface correspondingto said ina-p surface, said strip being pivotally connected thereto at acertain point, indications of desired points arranged on said strip, asecond strip extending in a surface corresponding to said map surface,said second strip being pivotally connected to said map surface, andindications on said second strip corresponding to said desired points.

al. In an educational device, the combination with a surface bearing amap, of strips extending in a surface corresponding to said map surface,means for pivotally connecting said strips at predetermined points onsaid map surface and names of points arranged on said strips at certainspaced distances corresponding to points desired to be located on saidmap. y.

5. In an educational device, the combination with a map surface, of astrip extending in a surface corresponding to said map surface, meansfor pivotally connecting said strip to said map surface at apredetermined point, a secondstrip extending in a surface correspondingto said map surface, means for pivotally connecting said second strip tosaid map surface at a second predetermined point, indications on ksaidfirst strip of desired points arranged relatively to one another inaccordance With the respective distances of said desired points fromsaid predetermined point and indications on said second strip of saiddesired points arranged relatively to one another in'accordance With therespective distances of said desired points from said secondpredetermined point.

ln testimony whereof I have signed this specification in the presence oftWo subscribing witnesses.

VALTER WV. HOLMES. Wfitnesses K.G. LE ARD, S. Banner..

Copies of this patent may be obtained for ve cents each,`by addressingthe Commissioner of Patents;

' Washington, D. C. Y

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